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Microsomal prostaglandin E2 synthase-1 (mPGES-1), with cyclooxygenase-2 (COX-2), synthesizes PGE2, which is directly involved in signaling during inflammation, fever, and pain. 5-Lipoxygenase (5-LO) initiates the synthesis of leukotrienes (LTs), which are pro-inflammatory mediators. YS-121 is a dual inhibitor of mPGES-1 (IC50 = 3.9 µM) and 5-LO (IC50 = 4.1 µM). It effectively inhibits PGE2 and LT synthesis in both cell free and intact cell assays. Moreover, YS-121 (1.5 mg/kg, intraperitoneal) reduced pleural levels of PGE2 and LTB4 while blocking exudate formation and leukocyte infiltration in carrageenan-induced rat pleurisy. YS-121 has minor effects on COX-1 and COX-2, inhibiting these enzymes 24.8% and 38%, respectively, at 10 µM.Formal Name: 2-[[4-chloro-6-[(2,3-dimethylphenyl)amino]-2-pyrimidinyl]thio]-octanoic acid. CAS Number: 916482-17-2. Molecular Formula: C20H26ClN3O2S. Formula Weight: 408.0. Purity: >98%. Formulation: (Request formulation change), A solution in methyl acetate. Solubility: DMF: 30 mg/ml, DMSO: 30 mg/ml, Ethanol: 30 mg/ml, Ethanol:PBS (pH 7.2) (1:1): 0.5 mg/ml. lambdamax: 203, 246, 292 nm. SMILES: CC1=C(NC2=CC(Cl)=NC(SC(C(O)=O)CCCCCC)=N2)C=CC=C1C. InChi Code: InChI=1S/C20H26ClN3O2S/c1-4-5-6-7-11-16(19(25)26)27-20-23-17(21)12-18(24-20)22-15-10-8-9-13(2)14(15)3/h8-10,12,16H,4-7,11H2,1-3H3,(H,25,26)(H,22,23,24). InChi Key: HVJBWTVMRIOTEL-UHFFFAOYSA-N.
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